Network Bonding or Trunking refers to the aggregation of multiple network ports into a single aggregated group, effectively aggregating the bandwidth of multiple interfaces into a single connection pipe. Bonding is used to provide network load balancing and fault tolerance
We are assuming that you are using CentOS 5.x
Step 1: Create a bond0 config file at /etc/sysconfig/network-scripts/ directory
# touch /etc/sysconfig/network-scripts/ifcfg-bond0 # vim /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0 ONBOOT=yes BOOTPROTO=none IPADDR=192.168.10.1 NETWORK=192.168.10.0 NETMASK=255.255.255.0 USERCTL=no
(Where IP is the Actual Address of the Bonded IP Address shared by the 2 physical NIC)
Step 2: Edit the configuration files of the 2 physical Network Cards (eth0 & eth1) that you wish to bond
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0 ONBOOT=yes BOOTPROTO=none MASTER=bond0 SLAVE=yes USERCTL=no
# vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1 ONBOOT=yes BOOTPROTO=none MASTER=bond0 SLAVE=yes USERCTL=no
Step 3: Load the Bond Module
alias bond0 bonding options bond0 mode=0 miimon=100
- RHEL bonding supports 7 possible “modes” for bonded interfaces. See Linux Bonding Modes website for more details on the modes.
- miimonspecifies (in milliseconds) how often MII link monitoring occurs. This is useful if high availability is required because MII is used to verify that the NIC is active.
Step 4: Load the bond driver module from the command prompt.
Step 5: Restart the network
Restart the network
Step 6: Verify the /proc setting.
Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)Bonding Mode: load balancing (round-robin) MII Status: up MII Polling Interval (ms): 0 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth0 MII Status: up Link Failure Count: 0 Permanent HW addr: xx:xx:xx:xx:xx:xx Slave Interface: eth1 MII Status: up Link Failure Count: 0 Permanent HW addr: yy:yy:yy:yy:yy:yy
Step 7: Final Tests
- Do a ifconfig to check everything is alright.
- ping from remote station to bond0 ipaddressAdvertisements